Brake-gear.



UNITED STATES PATENT OFFICE.Vv

FRANK Y HOFFMAN, or

DUNKIRK, EV YORK, ASSIGNOE OF ONE-HALF SEYlD/)N` K.

BUTTOLPH, OF DUNKIRK, NEW YORK. v I Y i BRAKE-GEAR.

Toall 'whom it may concern;

'Be it known that I, FRANK HorFMAN, a citizen ofthe United States, residing at Dunkirk, in-the county of Chautauqua and State of New IYork, have `invented vcertain. new and useful; 'Improvements 1n Brake-Geer;

and I do hereby declare theA following to oe 'a full, clear, and 'exactdescription of the invention, such eswillenable others skilled in the art t which itV appertainsto ineke and use'the same,'reference being had' to the 3.o-,

companyingdrawings, andto the letters of reference hiarked thereon, forming part. of

this specification,

. My inventionrelates to brake-gear and has for its objectpthe co'x'istruction of brake-operating gear whereby the -strainsnpon the upper and lower halves of a brake-band will 'at all times be eqaliied, and whereby the brekin resistance will be-the Same whether the bra {e-drum isrevolved'forward or bach-' The features of fnv invention are hereinafter fully explained andpo'inted out, and arerillustratcd in the accompanying drawingsin?whi eh: v

Figure l, is a side elevation. of the saine showingthe 'operating vvpinion in section. Fig. 2, 1sanedgewlseelevationof the same.

l applied to an internal brake. Fig. 4, is a vertical section of -tlie'sanie on the. line fL/l-y inA Fig. 3, looking i direction of the arrow.

Ini these rawings', indicates a brake drum flange; A', indicates s. wheel-hub upon vwhich the drum ange A, is seein-ed; B, indicates a brake-buildin,which,there is se,- cured suitable' ,friction ""iiterial B. Se'- curedl onone enf.. o the bil-nd B, is e pair of plein; (i C, in spaced relation toench other. each of seid Fletes C C, having :L segmental opening C', :.heiethrougli. Upon one sido of said opening;l C", in enc-h of'` said plates, I pro-fiile o. rash' ,of gferveth 0j The geen teeth o, arcpreierahly ff ined in the openings C', ofi" the `plates C, nearest to the brake-hand E. Upon' the opposite` end of the brake-hand B, I secure a plate D, adapt ed to slide between the plates C C. The plate D, provided with a segmental openin D', therethrough similar to' the opening in the 'plates C C, and in ,onev side, preferably ASpecification of Letters Patent.

Patented July 11, 1916.

Application filed NovemberA 19, 1914. Serial No. 872,884. i

the opening D', l provide-a rack of geen teeth (l. ",lr'ensvereely throiigh the openings C and-D" in the plates' C C and D, I place a geenpinion E, theteethof which'inter-` mesh with the gear-teeth. cond of the plates C C and D.

The pinion E, is provided `with a collar E',

(see Fig. 2) on one end thereof, ';and 'witha lever F, on the other end, which level* Fms a hub f. The lever F, ispreferahly secured in place by a nut F', or other suit'ahle'means to retain it in pla@ on the pinion E. The collars E and E', serve to retain the pinion E, in place in the openings C-r andDQin the plates C C and D.' Now, whenioweris upT plied to the lever F, the pinion E, is .rotated thereby, which operates to `"contract"vv the brake-hand B.

For supportingr the brake-'bend B, ont of Contact with the. drum A, when thebzind is open, 'as shown in Fig. "l, Ilprovide a supporting loop Gr, which is sccnrcd-to the brake-band B, and mounted o n the housing H, is an arm il", the end of which extends laterally through `the loop Gr, and therebyV supports the hralcehand E'. I also secure s.

bracket- HZ, upon the hoigsing, l, which ein` tends over an ear on the brake-hand B; and through an opening in braeketH2, I

pass a bolt H, which enters a screw threaded opening in the ear hand upon the holt H, above the bracket H2, place-a spring 71.', so tha t the 'orali-ebend B,is always Supported out of Contact witlrthe hrakefdrnr'n flange. A, when the hre-ke is open as shown in Fig. l. ln Fig. l, l have shown the pinion E, llei'n hollow, so that if desi red :1 supporting Y pin (not shown) muy he placed therein, from which that side ,of llze brakehand may 'ne supported, instead of from the camilla. Alllien the lining li", .of the hand hns lier-ome worn, it easy to i'e-:\d,il.1st the band closer to the drum 'my removing the, pinion l'l, :md Slightly moving the plates C C end'D, so that they will overlap each other farther und then replacing the pinion.

in Figs. 3 and 4, I have shown my invention embodied in an internal or expanding hralge, in which the plates ere oper-liedd by the pinion E, to expand the brake-hand against the interior Wall of the' brake-drum' ilfmge A.

ln Figs. and 4, the'lever F, is mounted A upon u stud-shaft F', 'which is jouruule-i in the housing H; and inside of the housing H, I secure on lsaidstud-shaft a levere.

Upon the pinion E, I secure a lever e', and I connect the levers eiand e by means of a. link eL so that power,jwhen applied to the lever F, is communicated to the pinion E, through the leversie e', and link e2. For snpporting the internalband B, out of Contact with the flange A, I secure a loop Gf thereon, which is engaged by a stud G2, securedon the housingH, and I provide springs g g, which are attached to loops b b, on the braleband B, and to the study-bolt F', the operation of which springs is -to cause said hr'akeband tomove away from the flange A, when the lever F, is released.

Having thus shown and descri'bed'the con-A ,.struction ofmy improved brake-gear, it is believed the operation lthereof is so obvious that further description thereof is unnecessary. I Y

' Therefore what I- claim as new and desire to secure hy Letters-Patent is 1. In friction brakegear, an open brake v `band,sp'aced slotted,plates secured on one end of said brake-balad, internal rack teeth in the side of the slots of said hars adjacent to said brake-band, a slotted plte secured to the opposite end of said brake-band,` f

ternal rack teeth inthe side of'the slot vof Y said har, farthest from said brake-band and a pinion in said slots intermeshing with said linternal rack teethv and engaging the sides of the slotsin said plates opposite said rack-teeth, substantially as set forth.

2. In a brake-gear, adru'm, a brake-band partially inclosing said drum, gear-racks se- .cured on each end of said band and overlap ping each other, a gear-pinion between said gear-racks and intermeshing therewith and supported thereby, means to rotate said inion, an arm rigidly supported with'referehoe .FRANK HOFFMAN.

Witnesses:

ELTON D. WARNER, IRENE E. MORRISON. 

